3x^2+5x-17+6x=20

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Solution for 3x^2+5x-17+6x=20 equation:


Simplifying
3x2 + 5x + -17 + 6x = 20

Reorder the terms:
-17 + 5x + 6x + 3x2 = 20

Combine like terms: 5x + 6x = 11x
-17 + 11x + 3x2 = 20

Solving
-17 + 11x + 3x2 = 20

Solving for variable 'x'.

Reorder the terms:
-17 + -20 + 11x + 3x2 = 20 + -20

Combine like terms: -17 + -20 = -37
-37 + 11x + 3x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-37 + 11x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-12.33333333 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '12.33333333' to each side of the equation.
-12.33333333 + 3.666666667x + 12.33333333 + x2 = 0 + 12.33333333

Reorder the terms:
-12.33333333 + 12.33333333 + 3.666666667x + x2 = 0 + 12.33333333

Combine like terms: -12.33333333 + 12.33333333 = 0.00000000
0.00000000 + 3.666666667x + x2 = 0 + 12.33333333
3.666666667x + x2 = 0 + 12.33333333

Combine like terms: 0 + 12.33333333 = 12.33333333
3.666666667x + x2 = 12.33333333

The x term is 3.666666667x.  Take half its coefficient (1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
3.666666667x + 3.361111114 + x2 = 12.33333333 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = 12.33333333 + 3.361111114

Combine like terms: 12.33333333 + 3.361111114 = 15.694444444
3.361111114 + 3.666666667x + x2 = 15.694444444

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 15.694444444

Calculate the square root of the right side: 3.961621441

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 3.961621441 and -3.961621441.

Subproblem 1

x + 1.833333334 = 3.961621441 Simplifying x + 1.833333334 = 3.961621441 Reorder the terms: 1.833333334 + x = 3.961621441 Solving 1.833333334 + x = 3.961621441 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = 3.961621441 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = 3.961621441 + -1.833333334 x = 3.961621441 + -1.833333334 Combine like terms: 3.961621441 + -1.833333334 = 2.128288107 x = 2.128288107 Simplifying x = 2.128288107

Subproblem 2

x + 1.833333334 = -3.961621441 Simplifying x + 1.833333334 = -3.961621441 Reorder the terms: 1.833333334 + x = -3.961621441 Solving 1.833333334 + x = -3.961621441 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = -3.961621441 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = -3.961621441 + -1.833333334 x = -3.961621441 + -1.833333334 Combine like terms: -3.961621441 + -1.833333334 = -5.794954775 x = -5.794954775 Simplifying x = -5.794954775

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.128288107, -5.794954775}

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